Researchers at the University of California, Riverside have developed a ductile and conductive transparent polymer material that enables self-repair of electronic devices and robots, especially for cell phone screens and cell phone batteries. The research results will be presented at the 253th annual meeting of the American Chemical Society.
Self-repairing material is a new type of material that can be repaired automatically when the object is cracked or damaged. Human skin has the ability to repair itself. Self-healing materials can be applied to mobile phones and batteries, allowing broken mobile phone screens to be repaired, or broken batteries to restore power.
The key to self-repair is chemical bonding. There are two types of bonds in the material: one is a strong covalent bond that is not easily reintegrated once it breaks, and the other is a weak non-covalent bond that is very active, such as a hydrogen bond. Most self-healing polymers mainly rely on hydrogen bonds or metal ligands, but these non-covalent bonds are not suitable for making ionic conductors.
This time, the researchers used non-covalent bonds of ion-dipole interactions, which possess a special kind of adhesion force that exists between charged ions and polar molecules. Ion-dipole interactions have never been applied to the design of self-healing polymers. New experiments have shown that they are particularly suitable for ionic conductors.
The new self-healing material consists of a polar extendable polymer, vinylidene fluoride and hexafluoropropylene polymer, and an ionized salt that can be stretched to 50 times the normal size. After it is broken in half, it can be Complete automatic docking within one day.
In order to test new materials, researchers used it to make an "artificial muscle" with an insulating film placed between two ion conductors. The results show that the new material can respond to electrical signals and drive artificial muscles to move.
Currently, researchers are testing this material under harsh conditions such as high humidity environments. Previously self-healing polymers did not perform well in high-humidity environments because the material would change its mechanical properties after entering the water. They are fine-tuning the polymer to make it more practical. (Reporter He Wei)
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